Thanks for your quick response. I appreciate that!
I'm not looking to change the USB port permanently. I don't mind if the headset (the USB headset includes both a set of earbuds as well as a microphone) only supports the microphone option when it's converted.
I saw a product that was similar to my own headset that had a converter like the one I want. But of course I didn't want to purchase that converter with the headset, only by itself.
FYI, I have a Logitech USB Headset 250 (http://www.radioshack.com/sm-logitec...i-2160351.html
Please let me know if there is anything non-permanent I can possibly do. I don't mind if I lose some functionality; like I mentioned earlier, I'm fine with using the headset as only headphones when converted to a 3.5mm jack. Also, if there's a jack out there that can convert the USB port to two plugs - one headphone and one mic-in, that would work perfectly.